R2262x Series
3-Wire Serial Interface Real Time Clock IC with Battery Backup Switch-over Function
NO.EA-226-160701
OUTLINE
The R2262x is a CMOS real-time clock IC connected to the CPU by three signal lines, CE, SCLK, SIO, and
configured to perform serial transmission of time and calendar data to the CPU. Further, battery backup
switchover circuit and a voltage detector are incorporated for secondary battery. The periodic interrupt circuit
is configured to generate interrupt signals with six selectable interrupts ranging from 0.5 seconds to 1 month.
The 2 alarm interrupt circuits generate interrupt signals at preset times. As the oscillation circuit is driven
under constant voltage, fluctuation of the oscillator frequency due to supply voltage is small, and the time
keeping current is small (Typ. 0.30µA at 3V). The oscillation halt sensing circuit can be used to judge the
validity of internal data in such events as power-on; the supply voltage monitoring circuit is configured to record
a drop in supply voltage below supply voltage monitoring threshold setting. The 32.768 kHz clock output
function (CMOS output) is intended to output sub-clock pulses for the external microcomputer. The oscillation
adjustment circuit is intended to adjust time counts with high precision by correcting deviations in the oscillation
frequency of the crystal oscillator. Battery backup switchover function is the automatic switchover circuit
between a main power supply and a backup battery of secondary battery. Since the package for this IC is
TSSOP10G (R2262T) or QFN0202-18 (R2262L), high density mounting of ICs on boards is possible.
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Minimum Timekeeping supply voltage Typ.0.6 to 5.5V (Worst: 0.9 V to 5.5 V); BAT pin
Ultra low power consumption
Typ.0.30
µA
at V
BAT
= 3V (Max. 0.90
µA)
Built-in Backup switchover circuit (can be used for a secondary battery, or an electric double-layer capacitor)
Three signal lines (CE, SCLK, and SIO) required for connection to the CPU.
(Maximum clock frequency of 1MHz (with VCC = 3V)
Time counters (counting hours, minutes, and seconds) and calendar counters (counting years, months,
days, and weeks) (in BCD format)
Interrupt circuit configured to generate interrupt signals (with interrupts ranging from 0.5 seconds to 1 month)
to the CPU and provided with an interrupt flag and an interrupt halt
2 alarm interrupt circuits (Alarm_W for week, hour, and minute alarm settings and Alarm_D for hour and
minute alarm settings)
Built-in voltage detector with delay
With Power-on flag to prove that the power supply starts from 0V
32-kHz clock output pin (CMOS push-pull output. “H” level is always equal to VCC.)
Supply voltage monitoring circuit with supply voltage monitoring threshold setting
Automatic identification of leap years up to the year 2099
Selectable 12-hour and 24-hour mode settings
High precision oscillation adjustment circuit
Built-in oscillation stabilization capacitors (CG and CD)
Package TSSOP10G (4.0 x 2.9 x 1.0: R2262T), QFN0202-18 (2.0 x 2.0 x 0.43: R2262L)
CMOS process
1
R2262x
NO.EA-226-160701
PIN CONFIGURATION
R2262L (QFN0202-18)
(TAB)
10
8
VRG
11
VCC
12
BAT
13
(TAB)
14
15
16
17
1
R2262Txx (TSSOP10G)
BAT
OSCIN
OSCOUT
(VSS)
INTR
1
2
3
4
5
10
9
8
7
6
VCC
VRG
OSCIN
OSCOUT
/VDCC
4
2
3
5
CLKOUT
SCLK
SIO
(VSS)
9
8
7
6
SCLK
SIO
CE
VSS
(TAB)
18
TOP VIEW
VDCC
(TAB)
(TAB)
CE
VSS
TOP VIEW
PIN DESCRIPTION
R2262L R2262T
(QFN) (TSSOP)
Pin No.
Symbol
CE
Item
Chip Enable Input
Description
2
4
16
2
SCLK
17
3
SIO
The CE pin is used for interfacing with the CPU.
Should be held high to allow access to the CPU.
Incorporates a pull-down resistor. Should be held
low or open when the CPU is powered off. Allows a
maximum input voltage of 5.5 volts regardless of
supply voltage.
Serial Clock Input
The SCLK pin is used to input clock pulses
synchronizing the input and output of data to and
from the SIO pin. Allows a maximum input voltage
of 5.5 volts regardless of supply voltage.
Serial Input / Output The SIO pin is used to input or output data intended
for writing or reading in synchronization with the
SCLK pin.
The INTR pin is used to output alarm interrupt
(Alarm_W) and alarm interrupt (Alarm_D) and output
periodic interrupt signals to the CPU signals.
Disabled at power-on from 0V. Nch. open drain
output.
32kHz Clock Output The CLKOUT pin is used to output 32.768-kHz clock
pulses. CMOS output. “H” level is always equal to
VCC.
Main Battery Input
Supply power to the IC.
Internal Power
Internal power output. Connect a capacitor as much
Output
as 0.1µF between VRG and VSS.
Interrupt Output
6
-
INTR
15
-
CLKOUT
12
11
10
9
VCC
VRG
4
R2262x
NO.EA-226-160701
Pin No.
R2262L R2262T
(QFN) (TSSOP)
Symbol
BAT
Item
Power Supply Input
for Secondary
Backup Battery
VCC Power Supply
Monitoring Result
Output
Description
Connect a secondary battery for backup. If VCC level
is equal or less than -VDET1, power is supplied from
this pin.
While monitoring VCC Power supply, if the voltage is
equal or lower than –V
DET1
, this output level is “L”.
When VDCC becomes “L”, SW1 turns off. When
VCC is equal to +V
DET1
or more, SW1 turns on. After t
DELAY passed, VDCC output becomes off, or “H”.
Nch Open-drain output.
The OSCIN and OSCOUT pins are used to connect
the 32.768-kHz quartz crystal unit (with all other
oscillation circuit components built into the R2262x).
The VSS pin is grounded.
Connect to ground line, or do not connect any lines.
Tab is GND level.
The tab is better to be connected to the GND.
13
1
4
6
VDCC
9
8
3
7,18
1,5,
10,14
8
7
5
-
-
OSCIN
OSCOUT
VSS
(VSS)
(TAB)
Oscillation Circuit
Input
Oscillation Circuit
Output
Negative Power
Sup Supply Input
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
